EPE Association: EPE 2018 - DS2h: Power Supplies

EPE 2018 - DS2h: Power Supplies
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2018 ECCE Europe - Conference > EPE 2018 - Topic 07: Power Supplies > EPE 2018 - DS2h: Power Supplies

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   An Improved Switching Technique for a Non-Isolated High Step-Down Voltage Ratio DC-DC Converter
By Stylianos SYRIGOS [View]
[Download]

Abstract: This paper focuses on a non-isolated high step-down voltage ratio DC-DC converter by addressing the PWM switching sequence problem, as well as proposing a new switching technique. The appropriate PWM switching sequence allows the converter to operate with very high conversion ratio, whereas the proposed technique offers a wide output voltage range of operation, maintaining however, the high step-down ratio characteristics. The converter operation under the appropriate PWM switching sequence and the proposed new one, is theoretically analyzed and validated using a laboratory experimental prototype.

   Bidirectional isolated DC/DC converter using NPC inverters suitable for high power application
By Yoshitaka KAWABATA [View]
[Download]

Abstract: We have already proposed a new control method of the bidirectional isolated dc/dc converter with a current resonant circuit which can perform zero-current switching and the power factor improvement by means of pulse width control. This method is that pulse width of the inverter of higher d.c. voltage is narrowed to make equal fundamental a.c. voltage of both inverters. However, in this current resonant circuit, because the reactor becomes large and the resistance increases, there is a problem that improvement of efficiency is not so high. In this paper, to solve these problems, a new bidirectional isolated dc/dc converter using the NPC 3-level inverter will be proposed.

   Double layer, printed racetrack coil, wireless power supply with receiver coil phase shift arrangement
By Michal BONISLAWSKI [View]
[Download]

Abstract: Proposed paper discusses FEM analysis, simulation and experimental verification of a low power, inductive, wireless energy transfer system for rotating shafts. For the purpose of flexibility the secondary side design features a phase - shifted, double - layer PCB coil design, that can also be implemented on flexible FR4 laminate. Coil design data and basic properties are provided for a ferromagnetic core based transmitter design and PCB coil receiver configuration as well as ferromagnetic foil on the receiver side. Basic excitation system topology is described with main electrical waveforms. Hard switching operation waveforms and basic analytical and experimental results are given.

   Effect of shielding and component placement in DM EMI filters on a power supply's conducted EMI
By Deniss STEPINS [View]
[Download]

Abstract: This paper considers the effect of copper shields placed between differential-mode CLC filtercomponents and the effect of the component placement on conducted electromagnetic interference of aswitch-mode power supply. The study is based on comparative measurements of a power supplyconducted electromagnetic interference for different configurations of the differential-mode filter. It isshown that using printed circuit board with two metal layers and shields can improve electromagneticinterference attenuation introduced by the filter.

   Evaluation of energy saving effect of traction power supply voltage in urban electric railway system
By Hitoshi HAYASHIYA [View]
[Download]

Abstract: The influence of the change of traction power supply voltage in DC electric railway in urban area is evaluated based on the operational data around Tokyo area in East Japan Railway Company. Generally speaking, the relation between traction power supply voltage and efficiency in railway power supply system is contradictive. Higher voltage has advantage in small resistive loss while lower voltage has advantage in wide usage of regenerative power. There is no common knowledge which advantage is superior in DC railway power supply system. In this paper, two examples are analyzed in detail. As a results, higher power supply voltage is appropriate at a substation with high operation density while lower supply voltage is better in a middle operation density substation.

   Handling differential mode conducted EMC in modular converters
By Théo LAMORELLE [View]
[Download]

Abstract: This paper presents the analysis and management of differential mode conducted EMI in modularconverters made from associations of standard conversion cells. Two main configurations, ISOP andIPOS are studied with the objective to define a generic EMI management technique, independent fromthe number of conversion standard cells implemented. First, analysis is carried out from a theoreticalpoint of view based on simplified models. Second filtering solutions are introduced and compared.Especially, centralized versus distributed filtering techniques are compared with the objective to findgeneric solutions. The results are compared and validated with practical characterizations.

   High efficiency 20kW SiC based Isolated DC-DC Converter for Battery Charger Applications
By Rakesh RAMACHANDRAN [View]
[Download]

Abstract: The paper presents the design, and demonstration of a high efficiency 20 kW SiC based isolated dc-dcconverter for battery charger application that can be used for fast charging or vehicle to grid charging.The paper discusses the design considerations and analysis of various losses in the converter. The dc-dcconverter has an input voltage of 700V and the output is connected to a 700V battery bank. The dc-dcconverter uses 1200V SiC MOSFET at the primary side and 1200V SiC diodes at the secondary side ofthe converter. The hardware prototype of the converter is developed and the efficiency of the converteris measured. The proposed converter has achieved a maximum measured conversion efficiency of97.8\%, 98.7\% and 98.9\%, at output voltages of 350 V, 560V and 686V respectively.

   Multiphase, synchronous GaN buck converters - efficiency based selection of the number of phases
By Marcin MARCINEK [View]
[Download]

Abstract: Proposed paper discusses an analytical, simulation based and experimental verification of efficiency profiles of multiphase, gallium nitride semiconductor based, synchronous buck converters. Loss calculations are provided and compared to experimental results. Based on loss analysis a proposal of an algorithm for efficiency - optimal choice of the number of phases is proposed. Test stand design and measurement setup descriptions are provided.

   Short-Circuit Fault Diagnosis and Post-Fault Control with Adaptive PLL-based Synchronization for a Multi-Phase Quasi-Square-Wave DC-DC Converter
By Mojtaba ASHOURLOO [View]
[Download]

Abstract: Fault-tolerant power management units have regained attention due to the rapid development of autonomous vehicles. This paper presents: 1) a fast short-circuit fault diagnosis method, which prevents turning on into a short-circuit, and 2) an adaptive post-fault control for a multi-phase variable-frequency Quasi-Square-Wave (QSW) synchronous buck converter with more than two phases. The converter employs GaN device as the primary switch due to its better figure-of-merit, while using Si device as protection switch due to superior short-circuit immunity. In this paper, the QSW operation mode and a multi-phase structure are combined to achieve enhanced efficiency and fault tolerance. The switching-node voltage during the dead-time intervals is used as the short-circuit fault signature. The adaptive post-fault control utilizes a PLL-based synchronization method in a closed daisy-chain arrangement to: 1) guarantee QSW operation mode regardless of the variable switching frequency due to the inductance value tolerance, and 2) automatically adjust the interleaving phase shifts between phases following a fault detection. The effectiveness of the proposed methods is evaluated and verified in a 75-W four-phase system.

   Single Switch Multi-Winding Wireless Power Transfer System Based On Z-Source Network
By Kaspars KROICS [View]
[Download]

Abstract: Nowadays the number of portable battery powered devices that requires frequent charging are rapidly growing worldwide. The main advantage for customers of wireless charging of such devices is ease of use and due to this reason wireless chargers are becoming more and more popular. To be able to charge devices from different vendors with one charging device introductions of standards for wireless power transfer is very important. Nowadays more common used standard is Qi, due to several limitations the increase of charging power is hard to increase. One of possible solution to increase the transferred power is to develop new power electronics converter topologies. In the paper it is proposed a new idea how by using Qi compliant coils transfer power to the receiver with modified power converter topology and coil position. The paper describes new inductive power transfer approach based on Z-source network tuned in resonant mode. The proposed topology allows reduce number of semiconductors, additional losses associated with non-sinusoidal signals can be reduced by further modification of the circuit. Theoretical justification along with simulation and experimental verification are presented in the paper.

EPE 2018 - DS2h: Power Supplies
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2018 ECCE Europe - Conference > EPE 2018 - Topic 07: Power Supplies > EPE 2018 - DS2h: Power Supplies
	[return to parent folder]

	An Improved Switching Technique for a Non-Isolated High Step-Down Voltage Ratio DC-DC Converter By Stylianos SYRIGOS	[View] [Download]
Abstract: This paper focuses on a non-isolated high step-down voltage ratio DC-DC converter by addressing the PWM switching sequence problem, as well as proposing a new switching technique. The appropriate PWM switching sequence allows the converter to operate with very high conversion ratio, whereas the proposed technique offers a wide output voltage range of operation, maintaining however, the high step-down ratio characteristics. The converter operation under the appropriate PWM switching sequence and the proposed new one, is theoretically analyzed and validated using a laboratory experimental prototype.

	Bidirectional isolated DC/DC converter using NPC inverters suitable for high power application By Yoshitaka KAWABATA	[View] [Download]
Abstract: We have already proposed a new control method of the bidirectional isolated dc/dc converter with a current resonant circuit which can perform zero-current switching and the power factor improvement by means of pulse width control. This method is that pulse width of the inverter of higher d.c. voltage is narrowed to make equal fundamental a.c. voltage of both inverters. However, in this current resonant circuit, because the reactor becomes large and the resistance increases, there is a problem that improvement of efficiency is not so high. In this paper, to solve these problems, a new bidirectional isolated dc/dc converter using the NPC 3-level inverter will be proposed.

	Double layer, printed racetrack coil, wireless power supply with receiver coil phase shift arrangement By Michal BONISLAWSKI	[View] [Download]
Abstract: Proposed paper discusses FEM analysis, simulation and experimental verification of a low power, inductive, wireless energy transfer system for rotating shafts. For the purpose of flexibility the secondary side design features a phase - shifted, double - layer PCB coil design, that can also be implemented on flexible FR4 laminate. Coil design data and basic properties are provided for a ferromagnetic core based transmitter design and PCB coil receiver configuration as well as ferromagnetic foil on the receiver side. Basic excitation system topology is described with main electrical waveforms. Hard switching operation waveforms and basic analytical and experimental results are given.

	Effect of shielding and component placement in DM EMI filters on a power supply's conducted EMI By Deniss STEPINS	[View] [Download]
Abstract: This paper considers the effect of copper shields placed between differential-mode CLC filtercomponents and the effect of the component placement on conducted electromagnetic interference of aswitch-mode power supply. The study is based on comparative measurements of a power supplyconducted electromagnetic interference for different configurations of the differential-mode filter. It isshown that using printed circuit board with two metal layers and shields can improve electromagneticinterference attenuation introduced by the filter.

	Evaluation of energy saving effect of traction power supply voltage in urban electric railway system By Hitoshi HAYASHIYA	[View] [Download]
Abstract: The influence of the change of traction power supply voltage in DC electric railway in urban area is evaluated based on the operational data around Tokyo area in East Japan Railway Company. Generally speaking, the relation between traction power supply voltage and efficiency in railway power supply system is contradictive. Higher voltage has advantage in small resistive loss while lower voltage has advantage in wide usage of regenerative power. There is no common knowledge which advantage is superior in DC railway power supply system. In this paper, two examples are analyzed in detail. As a results, higher power supply voltage is appropriate at a substation with high operation density while lower supply voltage is better in a middle operation density substation.

	Handling differential mode conducted EMC in modular converters By Théo LAMORELLE	[View] [Download]
Abstract: This paper presents the analysis and management of differential mode conducted EMI in modularconverters made from associations of standard conversion cells. Two main configurations, ISOP andIPOS are studied with the objective to define a generic EMI management technique, independent fromthe number of conversion standard cells implemented. First, analysis is carried out from a theoreticalpoint of view based on simplified models. Second filtering solutions are introduced and compared.Especially, centralized versus distributed filtering techniques are compared with the objective to findgeneric solutions. The results are compared and validated with practical characterizations.

	High efficiency 20kW SiC based Isolated DC-DC Converter for Battery Charger Applications By Rakesh RAMACHANDRAN	[View] [Download]
Abstract: The paper presents the design, and demonstration of a high efficiency 20 kW SiC based isolated dc-dcconverter for battery charger application that can be used for fast charging or vehicle to grid charging.The paper discusses the design considerations and analysis of various losses in the converter. The dc-dcconverter has an input voltage of 700V and the output is connected to a 700V battery bank. The dc-dcconverter uses 1200V SiC MOSFET at the primary side and 1200V SiC diodes at the secondary side ofthe converter. The hardware prototype of the converter is developed and the efficiency of the converteris measured. The proposed converter has achieved a maximum measured conversion efficiency of97.8\%, 98.7\% and 98.9\%, at output voltages of 350 V, 560V and 686V respectively.

	Multiphase, synchronous GaN buck converters - efficiency based selection of the number of phases By Marcin MARCINEK	[View] [Download]
Abstract: Proposed paper discusses an analytical, simulation based and experimental verification of efficiency profiles of multiphase, gallium nitride semiconductor based, synchronous buck converters. Loss calculations are provided and compared to experimental results. Based on loss analysis a proposal of an algorithm for efficiency - optimal choice of the number of phases is proposed. Test stand design and measurement setup descriptions are provided.

	Short-Circuit Fault Diagnosis and Post-Fault Control with Adaptive PLL-based Synchronization for a Multi-Phase Quasi-Square-Wave DC-DC Converter By Mojtaba ASHOURLOO	[View] [Download]
Abstract: Fault-tolerant power management units have regained attention due to the rapid development of autonomous vehicles. This paper presents: 1) a fast short-circuit fault diagnosis method, which prevents turning on into a short-circuit, and 2) an adaptive post-fault control for a multi-phase variable-frequency Quasi-Square-Wave (QSW) synchronous buck converter with more than two phases. The converter employs GaN device as the primary switch due to its better figure-of-merit, while using Si device as protection switch due to superior short-circuit immunity. In this paper, the QSW operation mode and a multi-phase structure are combined to achieve enhanced efficiency and fault tolerance. The switching-node voltage during the dead-time intervals is used as the short-circuit fault signature. The adaptive post-fault control utilizes a PLL-based synchronization method in a closed daisy-chain arrangement to: 1) guarantee QSW operation mode regardless of the variable switching frequency due to the inductance value tolerance, and 2) automatically adjust the interleaving phase shifts between phases following a fault detection. The effectiveness of the proposed methods is evaluated and verified in a 75-W four-phase system.

	Single Switch Multi-Winding Wireless Power Transfer System Based On Z-Source Network By Kaspars KROICS	[View] [Download]
Abstract: Nowadays the number of portable battery powered devices that requires frequent charging are rapidly growing worldwide. The main advantage for customers of wireless charging of such devices is ease of use and due to this reason wireless chargers are becoming more and more popular. To be able to charge devices from different vendors with one charging device introductions of standards for wireless power transfer is very important. Nowadays more common used standard is Qi, due to several limitations the increase of charging power is hard to increase. One of possible solution to increase the transferred power is to develop new power electronics converter topologies. In the paper it is proposed a new idea how by using Qi compliant coils transfer power to the receiver with modified power converter topology and coil position. The paper describes new inductive power transfer approach based on Z-source network tuned in resonant mode. The proposed topology allows reduce number of semiconductors, additional losses associated with non-sinusoidal signals can be reduced by further modification of the circuit. Theoretical justification along with simulation and experimental verification are presented in the paper.